3. Challenges

  1. Miguel Barreiros1 and
  2. Peter Lundqvist2

Published Online: 20 DEC 2010

DOI: 10.1002/9780470976814.ch3

QOS-Enabled Networks: Tools and Foundations

QOS-Enabled Networks: Tools and Foundations

How to Cite

Barreiros, M. and Lundqvist, P. (2011) Challenges, in QOS-Enabled Networks: Tools and Foundations, John Wiley & Sons, Ltd, Chichester, UK. doi: 10.1002/9780470976814.ch3

Author Information

  1. 1

    Juniper Networks, Portugal

  2. 2

    Juniper Networks, Sweden

Publication History

  1. Published Online: 20 DEC 2010
  2. Published Print: 7 JAN 2011

ISBN Information

Print ISBN: 9780470686973

Online ISBN: 9780470976814



  • challenges, role of QOS - providing each traffic type with behavior fitting its needs;
  • QOS behavior, stated in a provocative way - network, in which all traffic is equally “very important and top priority” no room for QOS;
  • Classes of Service, foundation of entire QOS concept - different behavior to different traffic types;
  • class of service representing a traffic aggregation group;
  • mapping between services and classes of service;
  • business drivers, shaping QoS deployment - with business drivers present;
  • classes of service and queues mapping;
  • QoS tools, inserting delay, and second group inserts delay - as transmission of packets between routers;
  • delay inherent in shaping tool - applied to packets crossing the shaper, selecting which classes of service are shaped;
  • MPLS network with traffic engineering (MPLS-TE) - traffic following predefined paths from source to destination


This chapter contains sections titled:

  • Defining the Classes of Service

  • Classes of Service and Queues Mapping

  • Inherent Delay Factors

  • Congestion Points

  • Trust Borders

  • Granularity Levels

  • Control Traffic

  • Trust, Granularity, and Control Traffic

  • Conclusion

  • Further Reading